Calculate the mass fraction of salt in a solution of copper sulfate 2, if copper hydroxide 2 with

Calculate the mass fraction of salt in a solution of copper sulfate 2, if copper hydroxide 2 with a mass of 9.8 g precipitates out of 160 g of such a solution.

1. Let’s write down the equation of the proceeding chemical reaction.

CuSO4 + 2NaOH = Cu (OH) 2 + Na2SO4.

2. Find the amount of the formed copper (II) hydroxide.

n (Cu (OH) 2) = m (Cu (OH) 2) / M (Cu (OH) 2) = 9.8 g / 98 g / mol = 0.1 mol.

3. Based on the composed reaction equation, we find the mass fraction of copper (II) sulfate in solution.

n (CuSO4) = n (Cu (OH) 2) = 0.1 mol.

m (CuSO4) = n (CuSO4) * M (CuSO4) = 0.1 mol * 160 g / mol = 16 g.

ω (CuSO4) = m (CuSO4) / m (solution) * 100% = 16 g / 160 g * 100% = 10%.

Answer: ω (CuSO4) = 10%.